23221221220 has 24 divisors (see below), whose sum is σ = 48774487608. Its totient is φ = 9286598400.

The previous prime is 23221221217. The next prime is 23221221223. The reversal of 23221221220 is 2212212232.

It is an interprime number because it is at equal distance from previous prime (23221221217) and next prime (23221221223).

It can be written as a sum of positive squares in 4 ways, for example, as 14043198016 + 9178023204 = 118504^2 + 95802^2 .

It is a super-2 number, since 2×23221221220² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23221221223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15201 + ... + 216040.

It is an arithmetic number, because the mean of its divisors is an integer number (2032270317).

Almost surely, 2^23221221220 is an apocalyptic number.

23221221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23221221220 is an abundant number, since it is smaller than the sum of its proper divisors (25553266388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23221221220 is a wasteful number, since it uses less digits than its factorization.

23221221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236271 (or 236269 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 23221221220 its reverse (2212212232), we get a palindrome (25433433452).

It can be divided in two parts, 232212212 and 20, that added together give a palindrome (232212232).

The spelling of 23221221220 in words is "twenty-three billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty".